TM-9-2815-205-34
ENGINE WITH CONTAINER; MODELS 5063-5299, 5063-5392, 5063-5393, 5063-5395, 5063-5398, 5063-539F, 5063-539L
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
AUGUST 1992
TM-9-2815-205-34 - Page 447 of 596
TM 9-2815-205-34
3-65. FUEL INJECTOR ASSEMBLY REPAIR (Cont)
(12)
(13)
(14)
(15)
(16)
(17)
Spring cage
(a) inspect for cracks, corrosion or varnish, and scratches on lapped sealing surfaces. lnspect
spring seat surface and needle valve seating surface for wear.
(b) Measure thickness of spring cage.
Minimum thickness is 0.602 inch.
Replace if necessary.
Spray tip
(a) Check for cracks, enlarged spray
holes, corrosion on outside diameter
taper, and oxide scale on spray hole
end. Check nut to tip sealing surface
and lapped sealing surface for
scratches. Do not use spray tip if
(b)
there are scale, cracks, or enlarged
spray holes.
Measure thickness of spray tip (2) shoulder. Minimum thickness is 0.199 inch.
Needle valve
Check spray tip needle valve for erosion
at seat shoulder, scratches, and
overheating.
Needle valve lift
Using needle valve height gage (32),
measure needle valve lift as follows:
(a)
(b)
(c)
(d)
Install needle valve (13) in spray tip
(2).
Press plunger of needle valve height
gage against a flat surface and zero
d i
in icator dial.
Place spray tip (2) and needle valve
(13) tight against bottom of gage with
quill of needle valve in hole in plunger.
While holding spray tip and needle valve assembly tight against gage (32), read needle
valve lift on indicator. Lift must be 0.008 to 0.018 inch. If needle valve lift exceeds 0.018
inch, replace tip assembly. If lift is less than 0.008 inch, inspect assembly for foreign
material between needle valve and tip seat.
Injector nut
Check injector nut for damaged threads, condition of preformed packing seating area, and
condition of spray tip seating area. Check spray tip hole for corrosion.
Spill deflector
Inspect ends of deflector for sharp edges or burrs.
3-320
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